1999 Isuzu Rodeo Question tube that connects expansion valve

DOTOWENS

MEMBER

1999 ISUZU RODEO

6 CYL

4WD

AUTOMATIC

186,000 MILES

I replaced the evaporator and the expansion valve but the tube that goes from the expansion valve through the firewall of the evaporator is leaking. Can not find the name of the tube and the part number to get a replacement.